Our information here is from Ontario Ministry of the Attorney General. Please be sure to find out your province government for right Power of Attorney guide (If there is different content).
You have two options to create your Power of Attorney:
1: Create a power of attorney yourself.
Download document from Ontario government official page page.
Or call ServiceOntario (Please check official website to get free 1-800 phone numbers) to mail you the document kit;
2: Looking for a lawyer write your power of attorney.
If you think your personal or business affairs are complicated, you can consider to see a lawyer.
Note that each power of attorney must be signed by you and two eligible witnesses. Some people are not allowed to be witnesses, including your spouse and your children.
Check more details from Ontario Government website.